Received: 26 July 2018
Accepted: 13 August 2019
First Online: 22 August 2019
Ethics approval and consent to participate
: The study and methodologies were approved by 14th Scientific Advisory Committee [SAC] of Indian Council of Medical Research Virus Unit, Kolkata and certified by Institutional Ethics Committees [IEC] of Dr. B.C. Roy Post Graduate Institute of Paediatric Sciences [Memo no: BCH/ME/PR/2657A]. Written informed consents were taken after explaining all associated positive and negative aspects regarding the study to the guardian of each participating patients, who were under the age of 16, in a language that they could comprehend easily [Bengali, A local language; Hindi, National language; and English, International language].
: Not applicable.
: The authors declare that they have no competing interests.